When you run a Visual Basic for Applications macro that performs numeric
calculations that result in a decimal value, the result that is returned
may be incorrect. For example, for the following calculation
n = 301.84 - 301
Visual Basic for Applications returns 0.839999999999975. The correct result
is 0.84.
Microsoft provides examples of Visual Basic for Applications procedures for
illustration only, without warranty either expressed or implied, including,
but not limited to the implied warranties of merchantability and/or fitness
for a particular purpose. The Visual Basic procedures in this article are
provided 'as is' and Microsoft does not guarantee that they can be used in
all situations. While Microsoft support professionals can help explain the
functionality of a particular macro, they will not modify these examples to
provide added functionality, nor will they help you construct macros to
meet your specific needs. If you have limited programming experience, you
may want to consult one of the Microsoft Solution Providers. Solution
Providers offer a wide range of fee-based services, including creating
custom macros. For more information about Microsoft Solution Providers,
call Microsoft Customer Information Service at (800) 426-9400.
To return the correct result rounded to a specific decimal place, use the
Format function.
The following example macro returns the correct result (.84) for the
calculation in this article:
n = CDbl(Format(301.84 - 301, "0.00"))
For more information about using the Format function, click the Office
Assistant in the Visual Basic Editor, type
Format Function, click Search, and then click to view the "Format
Function" topic.
NOTE: If the Assistant is hidden, click the Office Assistant button on the
Standard toolbar. If Visual Basic for Applications Help is not installed on
your computer, please see the following article in the Microsoft Knowledge
Base:
120802Â
(http://kbalertz.com/Feedback.aspx?kbNumber=120802/EN-US/
)
Office: How to Add/Remove a Single Office
Program or Component
Microsoft is researching this problem and will post new information here in
the Microsoft Knowledge Base as it becomes available.
For additional information, please see the following articles in the
Microsoft Knowledge Base:
126455Â
(http://kbalertz.com/Feedback.aspx?kbNumber=126455/EN-US/
)
How to Avoid Rounding & Overflow Probs on Pentium
Processors
42980Â
(http://kbalertz.com/Feedback.aspx?kbNumber=42980/EN-US/
)
(Complete) Tutorial to Understand IEEE Floating-Point Errors
69333Â
(http://kbalertz.com/Feedback.aspx?kbNumber=69333/EN-US/
)
How to Work Around Floating-Point Accuracy/Comparison
Problems